cregit-Linux how code gets into the kernel

Release 4.11 net/ipv4/devinet.c

Directory: net/ipv4
/*
 *      NET3    IP device support routines.
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 *      Derived from the IP parts of dev.c 1.0.19
 *              Authors:        Ross Biro
 *                              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *                              Mark Evans, <evansmp@uhura.aston.ac.uk>
 *
 *      Additional Authors:
 *              Alan Cox, <gw4pts@gw4pts.ampr.org>
 *              Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 *      Changes:
 *              Alexey Kuznetsov:       pa_* fields are replaced with ifaddr
 *                                      lists.
 *              Cyrus Durgin:           updated for kmod
 *              Matthias Andree:        in devinet_ioctl, compare label and
 *                                      address (4.4BSD alias style support),
 *                                      fall back to comparing just the label
 *                                      if no match found.
 */


#include <linux/uaccess.h>
#include <linux/bitops.h>
#include <linux/capability.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched/signal.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/if_addr.h>
#include <linux/if_ether.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/notifier.h>
#include <linux/inetdevice.h>
#include <linux/igmp.h>
#include <linux/slab.h>
#include <linux/hash.h>
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif
#include <linux/kmod.h>
#include <linux/netconf.h>

#include <net/arp.h>
#include <net/ip.h>
#include <net/route.h>
#include <net/ip_fib.h>
#include <net/rtnetlink.h>
#include <net/net_namespace.h>
#include <net/addrconf.h>


static struct ipv4_devconf ipv4_devconf = {
	.data = {
		[IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
		[IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
		[IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
		[IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
		[IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
		[IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] =  1000 /*ms*/,
        },
};


static struct ipv4_devconf ipv4_devconf_dflt = {
	.data = {
		[IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1,
		[IPV4_DEVCONF_SEND_REDIRECTS - 1] = 1,
		[IPV4_DEVCONF_SECURE_REDIRECTS - 1] = 1,
		[IPV4_DEVCONF_SHARED_MEDIA - 1] = 1,
		[IPV4_DEVCONF_ACCEPT_SOURCE_ROUTE - 1] = 1,
		[IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL - 1] = 10000 /*ms*/,
		[IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL - 1] =  1000 /*ms*/,
        },
};


#define IPV4_DEVCONF_DFLT(net, attr) \
	IPV4_DEVCONF((*net->ipv4.devconf_dflt), attr)


static const struct nla_policy ifa_ipv4_policy[IFA_MAX+1] = {
	[IFA_LOCAL]     	= { .type = NLA_U32 },
	[IFA_ADDRESS]   	= { .type = NLA_U32 },
	[IFA_BROADCAST] 	= { .type = NLA_U32 },
	[IFA_LABEL]     	= { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
	[IFA_CACHEINFO]		= { .len = sizeof(struct ifa_cacheinfo) },
	[IFA_FLAGS]		= { .type = NLA_U32 },
};


#define IN4_ADDR_HSIZE_SHIFT	8

#define IN4_ADDR_HSIZE		(1U << IN4_ADDR_HSIZE_SHIFT)


static struct hlist_head inet_addr_lst[IN4_ADDR_HSIZE];




static u32 inet_addr_hash(const struct net *net, __be32 addr)
{
	u32 val = (__force u32) addr ^ net_hash_mix(net);

	return hash_32(val, IN4_ADDR_HSIZE_SHIFT);
}


Contributors
PersonTokensPropCommitsCommitProp
David S. Miller2978.38%133.33%


Eric Dumazet821.62%266.67%


Total37100.00%3100.00%






static void inet_hash_insert(struct net *net, struct in_ifaddr *ifa)
{
	u32 hash = inet_addr_hash(net, ifa->ifa_local);

	ASSERT_RTNL();
	hlist_add_head_rcu(&ifa->hash, &inet_addr_lst[hash]);
}


Contributors
PersonTokensPropCommitsCommitProp
David S. Miller4293.33%250.00%


Américo Wang24.44%125.00%


Eric Dumazet12.22%125.00%


Total45100.00%4100.00%






static void inet_hash_remove(struct in_ifaddr *ifa)
{
	ASSERT_RTNL();
	hlist_del_init_rcu(&ifa->hash);
}


Contributors
PersonTokensPropCommitsCommitProp
David S. Miller2090.91%150.00%


Américo Wang29.09%150.00%


Total22100.00%2100.00%



/**
 * __ip_dev_find - find the first device with a given source address.
 * @net: the net namespace
 * @addr: the source address
 * @devref: if true, take a reference on the found device
 *
 * If a caller uses devref=false, it should be protected by RCU, or RTNL
 */



struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
{
	u32 hash = inet_addr_hash(net, addr);
	struct net_device *result = NULL;
	struct in_ifaddr *ifa;

	rcu_read_lock();
	hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash) {
		if (ifa->ifa_local == addr) {
			struct net_device *dev = ifa->ifa_dev->dev;

			if (!net_eq(dev_net(dev), net))
				continue;
			result = dev;
			break;
		}
	}
	if (!result) {
		struct flowi4 fl4 = { .daddr = addr };
		struct fib_result res = { 0 };
		struct fib_table *local;

		/* Fallback to FIB local table so that communication
                 * over loopback subnets work.
                 */
		local = fib_get_table(net, RT_TABLE_LOCAL);
		if (local &&
		    !fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
		    res.type == RTN_LOCAL)
			result = FIB_RES_DEV(res);
	}
	if (result && devref)
		dev_hold(result);
	rcu_read_unlock();
	return result;
}

Contributors
PersonTokensPropCommitsCommitProp
David S. Miller17294.51%266.67%


Eric Dumazet105.49%133.33%


Total182100.00%3100.00%




EXPORT_SYMBOL(__ip_dev_find);

static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);

static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
			 int destroy);
#ifdef CONFIG_SYSCTL
static int devinet_sysctl_register(struct in_device *idev);
static void devinet_sysctl_unregister(struct in_device *idev);
#else



static int devinet_sysctl_register(struct in_device *idev)
{
	return 0;
}

Contributors
PersonTokensPropCommitsCommitProp
Pavel Emelyanov857.14%150.00%


Américo Wang642.86%150.00%


Total14100.00%2100.00%






static void devinet_sysctl_unregister(struct in_device *idev)
{
}

Contributors
PersonTokensPropCommitsCommitProp
Pavel Emelyanov10100.00%1100.00%


Total10100.00%1100.00%



#endif

/* Locks all the inet devices. */




static struct in_ifaddr *inet_alloc_ifa(void)
{
	return kzalloc(sizeof(struct in_ifaddr), GFP_KERNEL);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1881.82%360.00%


Alexey Dobriyan313.64%120.00%


Panagiotis Issaris14.55%120.00%


Total22100.00%5100.00%






static void inet_rcu_free_ifa(struct rcu_head *head)
{
	struct in_ifaddr *ifa = container_of(head, struct in_ifaddr, rcu_head);
	if (ifa->ifa_dev)
		in_dev_put(ifa->ifa_dev);
	kfree(ifa);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2454.55%466.67%


Herbert Xu1840.91%116.67%


David S. Miller24.55%116.67%


Total44100.00%6100.00%






static void inet_free_ifa(struct in_ifaddr *ifa)
{
	call_rcu(&ifa->rcu_head, inet_rcu_free_ifa);
}


Contributors
PersonTokensPropCommitsCommitProp
David S. Miller1047.62%125.00%


Herbert Xu942.86%125.00%


Linus Torvalds (pre-git)29.52%250.00%


Total21100.00%4100.00%






void in_dev_finish_destroy(struct in_device *idev)
{
	struct net_device *dev = idev->dev;

	WARN_ON(idev->ifa_list);
	WARN_ON(idev->mc_list);
	kfree(rcu_dereference_protected(idev->mc_hash, 1));
#ifdef NET_REFCNT_DEBUG
	pr_debug("%s: %p=%s\n", __func__, idev, dev ? dev->name : "NIL");
#endif
	dev_put(dev);
	if (!idev->dead)
		pr_err("Freeing alive in_device %p\n", idev);
	else
		kfree(idev);
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7278.26%228.57%


Eric Dumazet1314.13%228.57%


Joe Perches44.35%114.29%


Ilpo Järvinen22.17%114.29%


Arnaldo Carvalho de Melo11.09%114.29%


Total92100.00%7100.00%




EXPORT_SYMBOL(in_dev_finish_destroy);




static struct in_device *inetdev_init(struct net_device *dev)
{
	struct in_device *in_dev;
	int err = -ENOMEM;

	ASSERT_RTNL();

	in_dev = kzalloc(sizeof(*in_dev), GFP_KERNEL);
	if (!in_dev)
		goto out;
	memcpy(&in_dev->cnf, dev_net(dev)->ipv4.devconf_dflt,
			sizeof(in_dev->cnf));
	in_dev->cnf.sysctl = NULL;
	in_dev->dev = dev;
	in_dev->arp_parms = neigh_parms_alloc(dev, &arp_tbl);
	if (!in_dev->arp_parms)
		goto out_kfree;
	if (IPV4_DEVCONF(in_dev->cnf, FORWARDING))
		dev_disable_lro(dev);
	/* Reference in_dev->dev */
	dev_hold(dev);
	/* Account for reference dev->ip_ptr (below) */
	in_dev_hold(in_dev);

	err = devinet_sysctl_register(in_dev);
	if (err) {
		in_dev->dead = 1;
		in_dev_put(in_dev);
		in_dev = NULL;
		goto out;
	}
	ip_mc_init_dev(in_dev);
	if (dev->flags & IFF_UP)
		ip_mc_up(in_dev);

	/* we can receive as soon as ip_ptr is set -- do this last */
	rcu_assign_pointer(dev->ip_ptr, in_dev);
out:
	return in_dev ?: ERR_PTR(err);
out_kfree:
	kfree(in_dev);
	in_dev = NULL;
	goto out;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)10949.55%735.00%


Américo Wang3817.27%15.00%


Arnaldo Carvalho de Melo209.09%15.00%


Ben Hutchings167.27%15.00%


David L Stevens156.82%210.00%


Eric Dumazet83.64%210.00%


Pavel Emelyanov52.27%15.00%


Hideaki Yoshifuji / 吉藤英明31.36%15.00%


David S. Miller20.91%15.00%


Jarek Poplawski20.91%15.00%


Herbert Xu10.45%15.00%


Panagiotis Issaris10.45%15.00%


Total220100.00%20100.00%






static void in_dev_rcu_put(struct rcu_head *head)
{
	struct in_device *idev = container_of(head, struct in_device, rcu_head);
	in_dev_put(idev);
}


Contributors
PersonTokensPropCommitsCommitProp
Herbert Xu31100.00%1100.00%


Total31100.00%1100.00%






static void inetdev_destroy(struct in_device *in_dev)
{
	struct in_ifaddr *ifa;
	struct net_device *dev;

	ASSERT_RTNL();

	dev = in_dev->dev;

	in_dev->dead = 1;

	ip_mc_destroy_dev(in_dev);

	while ((ifa = in_dev->ifa_list) != NULL) {
		inet_del_ifa(in_dev, &in_dev->ifa_list, 0);
		inet_free_ifa(ifa);
	}

	RCU_INIT_POINTER(dev->ip_ptr, NULL);

	devinet_sysctl_unregister(in_dev);
	neigh_parms_release(&arp_tbl, in_dev->arp_parms);
	arp_ifdown(dev);

	call_rcu(&in_dev->rcu_head, in_dev_rcu_put);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7870.27%433.33%


Herbert Xu2421.62%433.33%


Hideaki Yoshifuji / 吉藤英明43.60%18.33%


Eric Dumazet32.70%18.33%


Pavel Emelyanov10.90%18.33%


Stephen Hemminger10.90%18.33%


Total111100.00%12100.00%






int inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b)
{
	rcu_read_lock();
	for_primary_ifa(in_dev) {
		if (inet_ifa_match(a, ifa)) {
			if (!b || inet_ifa_match(b, ifa)) {
				rcu_read_unlock();
				return 1;
			}
		}
	} endfor_ifa(in_dev);
	rcu_read_unlock();
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)5988.06%571.43%


David S. Miller68.96%114.29%


Al Viro22.99%114.29%


Total67100.00%7100.00%






static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
			 int destroy, struct nlmsghdr *nlh, u32 portid)
{
	struct in_ifaddr *promote = NULL;
	struct in_ifaddr *ifa, *ifa1 = *ifap;
	struct in_ifaddr *last_prim = in_dev->ifa_list;
	struct in_ifaddr *prev_prom = NULL;
	int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);

	ASSERT_RTNL();

	if (in_dev->dead)
		goto no_promotions;

	/* 1. Deleting primary ifaddr forces deletion all secondaries
         * unless alias promotion is set
         **/

	if (!(ifa1->ifa_flags & IFA_F_SECONDARY)) {
		struct in_ifaddr **ifap1 = &ifa1->ifa_next;

		while ((ifa = *ifap1) != NULL) {
			if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
			    ifa1->ifa_scope <= ifa->ifa_scope)
				last_prim = ifa;

			if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
			    ifa1->ifa_mask != ifa->ifa_mask ||
			    !inet_ifa_match(ifa1->ifa_address, ifa)) {
				ifap1 = &ifa->ifa_next;
				prev_prom = ifa;
				continue;
			}

			if (!do_promote) {
				inet_hash_remove(ifa);
				*ifap1 = ifa->ifa_next;

				rtmsg_ifa(RTM_DELADDR, ifa, nlh, portid);
				blocking_notifier_call_chain(&inetaddr_chain,
						NETDEV_DOWN, ifa);
				inet_free_ifa(ifa);
			} else {
				promote = ifa;
				break;
			}
		}
	}

	/* On promotion all secondaries from subnet are changing
         * the primary IP, we must remove all their routes silently
         * and later to add them back with new prefsrc. Do this
         * while all addresses are on the device list.
         */
	for (ifa = promote; ifa; ifa = ifa->ifa_next) {
		if (ifa1->ifa_mask == ifa->ifa_mask &&
		    inet_ifa_match(ifa1->ifa_address, ifa))
			fib_del_ifaddr(ifa, ifa1);
	}

no_promotions:
	/* 2. Unlink it */

	*ifap = ifa1->ifa_next;
	inet_hash_remove(ifa1);

	/* 3. Announce address deletion */

	/* Send message first, then call notifier.
           At first sight, FIB update triggered by notifier
           will refer to already deleted ifaddr, that could confuse
           netlink listeners. It is not true: look, gated sees
           that route deleted and if it still thinks that ifaddr
           is valid, it will try to restore deleted routes... Grr.
           So that, this order is correct.
         */
	rtmsg_ifa(RTM_DELADDR, ifa1, nlh, portid);
	blocking_notifier_call_chain(&inetaddr_chain, NETDEV_DOWN, ifa1);

	if (promote) {
		struct in_ifaddr *next_sec = promote->ifa_next;

		if (prev_prom) {
			prev_prom->ifa_next = promote->ifa_next;
			promote->ifa_next = last_prim->ifa_next;
			last_prim->ifa_next = promote;
		}

		promote->ifa_flags &= ~IFA_F_SECONDARY;
		rtmsg_ifa(RTM_NEWADDR, promote, nlh, portid);
		blocking_notifier_call_chain(&inetaddr_chain,
				NETDEV_UP, promote);
		for (ifa = next_sec; ifa; ifa = ifa->ifa_next) {
			if (ifa1->ifa_mask != ifa->ifa_mask ||
			    !inet_ifa_match(ifa1->ifa_address, ifa))
					continue;
			fib_add_ifaddr(ifa);
		}

	}
	if (destroy)
		inet_free_ifa(ifa1);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)16737.78%738.89%


Jamal Hadi Salim13029.41%15.56%


Julian Anastasov5311.99%211.11%


Harald Welte4510.18%15.56%


David S. Miller214.75%211.11%


Thomas Graf173.85%15.56%


Eric W. Biedermann40.90%15.56%


Alan Stern30.68%15.56%


Herbert Xu10.23%15.56%


Hideaki Yoshifuji / 吉藤英明10.23%15.56%


Total442100.00%18100.00%






static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
			 int destroy)
{
	__inet_del_ifa(in_dev, ifap, destroy, NULL, 0);
}


Contributors
PersonTokensPropCommitsCommitProp
Thomas Graf3193.94%150.00%


Linus Torvalds (pre-git)26.06%150.00%


Total33100.00%2100.00%



static void check_lifetime(struct work_struct *work);

static DECLARE_DELAYED_WORK(check_lifetime_work, check_lifetime);




static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
			     u32 portid)
{
	struct in_device *in_dev = ifa->ifa_dev;
	struct in_ifaddr *ifa1, **ifap, **last_primary;

	ASSERT_RTNL();

	if (!ifa->ifa_local) {
		inet_free_ifa(ifa);
		return 0;
	}

	ifa->ifa_flags &= ~IFA_F_SECONDARY;
	last_primary = &in_dev->ifa_list;

	for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL;
	     ifap = &ifa1->ifa_next) {
		if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&
		    ifa->ifa_scope <= ifa1->ifa_scope)
			last_primary = &ifa1->ifa_next;
		if (ifa1->ifa_mask == ifa->ifa_mask &&
		    inet_ifa_match(ifa1->ifa_address, ifa)) {
			if (ifa1->ifa_local == ifa->ifa_local) {
				inet_free_ifa(ifa);
				return -EEXIST;
			}
			if (ifa1->ifa_scope != ifa->ifa_scope) {
				inet_free_ifa(ifa);
				return -EINVAL;
			}
			ifa->ifa_flags |= IFA_F_SECONDARY;
		}
	}

	if (!(ifa->ifa_flags & IFA_F_SECONDARY)) {
		prandom_seed((__force u32) ifa->ifa_local);
		ifap = last_primary;
	}

	ifa->ifa_next = *ifap;
	*ifap = ifa;

	inet_hash_insert(dev_net(in_dev->dev), ifa);

	cancel_delayed_work(&check_lifetime_work);
	queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);

	/* Send message first, then call notifier.
           Notifier will trigger FIB update, so that
           listeners of netlink will know about new ifaddr */
	rtmsg_ifa(RTM_NEWADDR, ifa, nlh, portid);
	blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)23781.72%535.71%


Jiri Pirko134.48%17.14%


Thomas Graf134.48%17.14%


David S. Miller124.14%17.14%


Aruna-Hewapathirane51.72%17.14%


Viresh Kumar31.03%17.14%


Herbert Xu31.03%17.14%


Eric W. Biedermann20.69%17.14%


Alan Stern10.34%17.14%


Arnaldo Carvalho de Melo10.34%17.14%


Total290100.00%14100.00%






static int inet_insert_ifa(struct in_ifaddr *ifa)
{
	return __inet_insert_ifa(ifa, NULL, 0);
}


Contributors
PersonTokensPropCommitsCommitProp
Thomas Graf21100.00%1100.00%


Total21100.00%1100.00%






static int inet_set_ifa(struct net_device *dev, struct in_ifaddr *ifa)
{
	struct in_device *in_dev = __in_dev_get_rtnl(dev);

	ASSERT_RTNL();

	if (!in_dev) {
		inet_free_ifa(ifa);
		return -ENOBUFS;
	}
	ipv4_devconf_setall(in_dev);
	neigh_parms_data_state_setall(in_dev->arp_parms);
	if (ifa->ifa_dev != in_dev) {
		WARN_ON(ifa->ifa_dev);
		in_dev_hold(in_dev);
		ifa->ifa_dev = in_dev;
	}
	if (ipv4_is_loopback(ifa->ifa_local))
		ifa->ifa_scope = RT_SCOPE_HOST;
	return inet_insert_ifa(ifa);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)8983.96%541.67%


Herbert Xu76.60%325.00%


Jiri Pirko76.60%18.33%


Joe Perches10.94%18.33%


Ilpo Järvinen10.94%18.33%


Arnaldo Carvalho de Melo10.94%18.33%


Total106100.00%12100.00%



/* Caller must hold RCU or RTNL :
 * We dont take a reference on found in_device
 */



struct in_device *inetdev_by_index(struct net *net, int ifindex)
{
	struct net_device *dev;
	struct in_device *in_dev = NULL;

	rcu_read_lock();
	dev = dev_get_by_index_rcu(net, ifindex);
	if (dev)
		in_dev = rcu_dereference_rtnl(dev->ip_ptr);
	rcu_read_unlock();
	return in_dev;
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4374.14%555.56%


Eric Dumazet813.79%222.22%


Denis V. Lunev610.34%111.11%


Eric W. Biedermann11.72%111.11%


Total58100.00%9100.00%




EXPORT_SYMBOL(inetdev_by_index);

/* Called only from RTNL semaphored context. No locks. */




struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
				    __be32 mask)
{
	ASSERT_RTNL();

	for_primary_ifa(in_dev) {
		if (ifa->ifa_mask == mask && inet_ifa_match(prefix, ifa))
			return ifa;
	} endfor_ifa(in_dev);
	return NULL;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)5196.23%583.33%


Al Viro23.77%116.67%


Total53100.00%6100.00%






static int ip_mc_config(struct sock *sk, bool join, const struct in_ifaddr *ifa)
{
	struct ip_mreqn mreq = {
		.imr_multiaddr.s_addr = ifa->ifa_address,
		.imr_ifindex = ifa->ifa_dev->dev->ifindex,
        };
	int ret;

	ASSERT_RTNL();

	lock_sock(sk);
	if (join)
		ret = ip_mc_join_group(sk, &mreq);
	else
		ret = ip_mc_leave_group(sk, &mreq);
	release_sock(sk);

	return ret;
}


Contributors
PersonTokensPropCommitsCommitProp
Madhu Challa8897.78%150.00%


Marcelo Ricardo Leitner22.22%150.00%


Total90100.00%2100.00%






static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
{
	struct net *net = sock_net(skb->sk);
	struct nlattr *tb[IFA_MAX+1];
	struct in_device *in_dev;
	struct ifaddrmsg *ifm;
	struct in_ifaddr *ifa, **ifap;
	int err = -EINVAL;

	ASSERT_RTNL();

	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv4_policy);
	if (err < 0)
		goto errout;

	ifm = nlmsg_data(nlh);
	in_dev = inetdev_by_index(net, ifm->ifa_index);
	if (!in_dev) {
		err = -ENODEV;
		goto errout;
	}

	for (ifap = &in_dev->ifa_list; (ifa = *ifap) != NULL;
	     ifap = &ifa->ifa_next) {
		if (tb[IFA_LOCAL] &&
		    ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL]))
			continue;

		if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
			continue;

		if (tb[IFA_ADDRESS] &&
		    (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
		    !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa)))
			continue;

		if (ipv4_is_multicast(ifa->ifa_address))
			ip_mc_config(net->ipv4.mc_autojoin_sk, false, ifa);
		__inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
		return 0;
	}

	err = -EADDRNOTAVAIL;
errout:
	return err;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)13949.82%633.33%


Thomas Graf9634.41%316.67%


Madhu Challa227.89%15.56%


Denis V. Lunev113.94%211.11%


Arnaldo Carvalho de Melo31.08%15.56%


Hideaki Yoshifuji / 吉藤英明31.08%15.56%


Jiri Benc20.72%15.56%


Ian Morris10.36%15.56%


Eric W. Biedermann10.36%15.56%


Adrian Bunk10.36%15.56%


Total279100.00%18100.00%




#define INFINITY_LIFE_TIME	0xFFFFFFFF




static void check_lifetime(struct work_struct *work)
{
	unsigned long now, next, next_sec, next_sched;
	struct in_ifaddr *ifa;
	struct hlist_node *n;
	int i;

	now = jiffies;
	next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);

	for (i = 0; i < IN4_ADDR_HSIZE; i++) {
		bool change_needed = false;

		rcu_read_lock();
		hlist_for_each_entry_rcu(ifa, &inet_addr_lst[i], hash) {
			unsigned long age;

			if (ifa->ifa_flags & IFA_F_PERMANENT)
				continue;

			/* We try to batch several events at once. */
			age = (now - ifa->ifa_tstamp +
			       ADDRCONF_TIMER_FUZZ_MINUS) / HZ;

			if (ifa->ifa_valid_lft != INFINITY_LIFE_TIME &&
			    age >= ifa->ifa_valid_lft) {
				change_needed = true;
			} else if (ifa->ifa_preferred_lft ==
				   INFINITY_LIFE_TIME) {
				continue;
			} else if (age >= ifa->ifa_preferred_lft) {
				if (time_before(ifa->ifa_tstamp +
						ifa->ifa_valid_lft * HZ, next))
					next = ifa->ifa_tstamp +
					       ifa->ifa_valid_lft * HZ;

				if (!(ifa->ifa_flags & IFA_F_DEPRECATED))
					change_needed = true;
			} else if (time_before(ifa->ifa_tstamp +
					       ifa->ifa_preferred_lft * HZ